Purpose : Check whether element is present in list or not.Returns True : if obj is an element of the invoking collectionReturns False : if obj is not an element of the invoking collection

5

boolean containsAll(Collection c1)

Purpose : Check whether all elements is present in list or not.Returns True : if the invoking collection contains all elements of c1Returns False : if the invoking collection does not contains all elements of c1

6

boolean equals(Object obj)

Purpose : Check equality.Returns True : if the invoking collection and obj are equalReturns False : if the invoking collection and obj are not equal